# frozen_string_literal: true
module M3u8
  # ByteRange represents sub range of a resource
  class ByteRange
    attr_accessor :length, :start

    def initialize(params = {})
      params.each do |key, value|
        instance_variable_set("@#{key}", value)
      end
    end

    def self.parse(text)
      values = text.split('@')
      length_value = values[0].to_i
      start_value = values[1].to_i unless values[1].nil?
      options = { length: length_value, start: start_value }
      ByteRange.new(options)
    end

    def to_s
      "#{length}#{start_format}"
    end

    private

    def start_format
      return if start.nil?
      "@#{start}"
    end
  end
end